"Because the beauty of the human body is that it hasn't a single muscle which doesn't serve its purpose; that there's not a line wasted; that every detail of it fits one idea, the idea of a man and the life of a man."

Mr. Fahrenheit is right, Mercury in thermometer is rising on the high temperatures and lowering on low ones. So when it's colder red should go down instead of up like in first thermometer. Mercury is contained in the bulb and it's just expanding and shrinking depending on temperature.

Out of all people Mr. Fahrenheit definitely knows thing or two about temperature.